Hello,

That is a security message from Windows 7 when the MAPI email option is being used in the Adagio email setup. It's there to prevent malicious software from automatically sending emails.
Since Windows 7 is near end of life, they should just upgrade to Windows 10 and use the "Outlook" option in the Adagio email setup. They shouldn't get that prompt anymore. The other alternatives are to buy and download a program called "Click Yes" that will override that setting or to set up Direct settings using your SMTP server.